M365EXO-005: Safe Links policy
- Plataforma
- Entra ID / M365
- Categoría
- Advanced Threat Protection
- Severidad
- High
- Pilar de Zero Trust
- Applications & Workloads (peso 2)
- Fixtures de referencia
- 3
- Cobertura de ramas
- Observada: los fixtures prueban los veredictos que ejercitan
- Procedencia
- baseline
Qué comprueba
Safe Links in Microsoft Defender for Office 365 provides time-of-click URL verification to protect users from malicious links in email messages and Office documents. Attackers commonly use deferred phishing techniques where a URL is benign at delivery time but is changed to point to a malicious site after the email passes initial scanning. Without Safe Links, users clicking on these weaponized URLs after delivery are unprotected.
Valor recomendado
Safe Links enabled for email and Office apps; URL rewriting enabled; do not allow click-through to malicious URLs; real-time scanning enabled
Remediación
Configure a Safe Links policy that applies to all users with URL scanning enabled for email messages and Microsoft Office applications. Enable the setting to block users from clicking through to detected malicious URLs and turn on real-time URL scanning for suspicious links. Do not add broad URL exceptions to the do-not-rewrite list and review any existing exceptions to ensure they are still necessary and do not create security gaps.
Veredictos probados con fixtures
Cada veredicto de esta tabla está probado por un fixture de referencia en la suite de pruebas que valida el módulo. La tabla se deriva de la última ejecución en verde; no puede editarse a mano.
| Escenario | Veredicto esperado |
|---|---|
| clean | PASS |
| empty | WARN |
| throttled | Not Assessed |
Mapeos a marcos de referencia
- NIST SP 800-53
- SI-3
- CIS M365 Benchmark
- 2.1.5
- MITRE ATT&CK
- T1566.002